﴿وَآيَةٌ لَهُمُ اللَّيْلُ نَسْلَخُ مِنْهُ النَّهَارَ فَإِذَا هُمْ مُظْلِمُونَ﴾ 37. And a sign for them is the night. We withdraw therefrom the day, and behold, they are in darkness.